8.8.2
Block due to non-ignition
P
TL
t
2
P H
t
2p
K
MV
M
I
V 1
F
Yellow
LED
Signal not required
D7232
8.8.3
Block due to extraneous light during the pre-
purging
P
TL
t
2
P H
t
2p
K
MV
M
I
V 1
F
Yellow
LED
Block due to extraneous light during the preheating
t
2L
F
Yellow
Yellow
LED
20011755
t
1
t
3
t
4i
t
t
s
5i
Green+Yellow
Green
Red
Fig. 21
t
1
t
3
t
s
.
t
3l
Green
Red+Yellow
.
Block
Red
Fig. 22
Operation
Key to lay-out
F
– Flame detector
I
– Ignition transformer
K
– Enabling switch thermostat for start up after preheating
LED
– Signal of operation status from reset button
MV
– Fan motor
PH
– Diesel oil heater
TL
– Limit thermostat
V1
– Oil valve
Red
Green + Yellow slow blinking
Green + Yellow fast blinking
Yellow
Green
Green + Yellow medium blinking
Red + Yellow fast blinking
Yellow fast blinking
Operating times
t1
max
t1I
max
t2
-
t2I
max
t2p
max
t3
-
t3I
max
The time is expressed in seconds
8.9
Fuel heating
In order to assure regular ignition and operation even at low tem-
peratures the burner has an oil heater fitted in combustion head.
The heater turns on when the thermostats close. The enabling
signal for burner start up comes through a thermostat on the noz-
zle holder once the optimal ignition temperature is reached. The
heating remains on during operation and cuts out when the burn-
er shuts-down.
D7231
20
GB
1
ts
30
t4i
3
t5i
30
t4I
600
t6
15
t6I
1
t7
-
5
-
8
-
3
max
1
max
360
max
30
-
120